The effect of temperature on the photochemical reaction rate of benzophenone in acetonitrile solvent under UV light irradiation can be explained by considering the factors that influence the reaction rate, such as the activation energy, the reaction rate constant, and the collision frequency of the molecules.1. Activation energy: The activation energy is the minimum energy required for a reaction to occur. As the temperature increases, the average kinetic energy of the molecules also increases, which means that more molecules will have the necessary energy to overcome the activation energy barrier. This leads to an increase in the reaction rate.2. Reaction rate constant: The reaction rate constant k is directly related to the temperature of the system. According to the Arrhenius equation, the reaction rate constant increases exponentially with temperature:k = Ae^-Ea/RT where A is the pre-exponential factor, Ea is the activation energy, R is the gas constant, and T is the temperature in Kelvin. As the temperature increases, the reaction rate constant also increases, leading to a faster reaction rate.3. Collision frequency: As the temperature increases, the molecules in the solution move faster, leading to a higher collision frequency between the reactants. This increased collision frequency results in a higher probability of successful collisions, which in turn increases the reaction rate.In summary, an increase in temperature generally leads to an increase in the photochemical reaction rate of benzophenone in acetonitrile solvent under UV light irradiation. However, it is important to note that the specific effect of temperature on the reaction rate may vary depending on the particular reaction conditions and the nature of the reactants and products involved.